USR-WIFI232-B2 Hardware Manual
www.usriot.com
Jinan USR IOT Technology Limited 4 / 9
h.usriot.com
1.3.
Pin Defination
PIN
Name
Signal Type
Defination
1
GND
P
Power Ground
2
VCC
P
3.3V @ 350mA power input
3
UART_TXD
O
If don
’t use UART function, this four pins can be
configured as GPIO pins, and can change GPIO pin
status through AT command.
GPIO3
I/O
4
UART_RXD
I
GPIO4
I/O
5
UART_RTS
O
GPIO5
I/O
6
UART_CTS
I
GPIO6
I/O
7
RESET
I
Take effect in low level.
8
nLink
O
Output high level: WIFI connection available.
Output low level: WIFI connection not available.
Can be configured as GPIO.
GPIO8
I/O
9
nReady
O
After module starting, output high level or heartbeat
signal.
Can be configured as GPIO.
GPIO9
I/O
10
nReload
I
Take effect in low level. Press over 3s restore factory
settings.
GPIO10
I/O
11
I
Ethernet Input+
12
PHY_RX-
I
Ethernet Input-
13
O
Ethernet
14
PHY_TX-
O
Ethernet Output-
